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From April to July 2018, a data sample at the peak energy of the Υ(4S) resonance was collected with the Belle II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle II experiment. Using Bhabha and digamma events, we measure the integrated luminosity of the data sample to be (469.3±0.3±3.0) pb-1, where the first uncertainty is statistical and the second is systematic. This work provides a basis for future luminosity measurements at Belle II.

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Abudinén, F., Adachi, I., Ahlburg, P., Aihara, H., Akopov, N., Aloisio, A., Ameli, F., Andricek, L., Anh Ky, N., Asner, D. M., Atmacan, H., Aushev, T., Aushev, V., Aziz, T., Azmi, K., Babu, V., Baehr, S., Bahinipati, S., Bakich, A. M., … Zupanc, A. (2020). Measurement of the integrated luminosity of the phase 2 data of the Belle II experiment *. Chinese Physics C, 44(2), 021001.

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